Make One New Div in magento2 Using XML

<referenceContainer name="page.wrapper">
    <container name="your.custom.name" as="your-custom" label="Your Label Name" htmlTag="div" htmlClass="your-class" htmlId="your-id" before="main.content">
        <block class="Magento\Framework\View\Element\Template" name="custom.file" template="Vendor_Module::custom.phtml" /><!-- This is just an example -->
    </container>
</referenceContainer><referenceContainer name="page.wrapper">
    <container name="your.custom.name" as="your-custom" label="Your Label Name" htmlTag="div" htmlClass="your-class" htmlId="your-id" before="main.content">
        <block class="Magento\Framework\View\Element\Template" name="custom.file" template="Vendor_Module::custom.phtml" /><!-- This is just an example -->
    </container>
</referenceContainer>

without PHTML

<referenceContainer name="page.wrapper">
    <container name="your.custom.name" as="your-custom" label="Your Label Name" htmlTag="div" htmlClass="your-class" htmlId="your-id" before="page-footer"/>
</referenceContainer>
<move element="main.content" destination="your.custom.name"/>